Rapid Analysis Report: Scientific Anatomy of the 26 August 2026 Bhotekoshi Flash Flood

Rapid multi-source analysis of the suspected trigger, chronology, downstream propagation, consequences, response, and vulnerability associated with the 26 August Bhotekoshi–Trishuli flood.

Status
Reviewed
Provider
Integrated Research on Disaster Risk (IRDR)
Resource type
Rapid Analysis Report
Evidence class
Multi Source Secondary Analysis

Identity and coverage

Catalogue identifier
res-aff0feff-9088-513d-8718-75502c0dce09
Persistent identifier
Not stated
Resource version
Report status 26 August 2026, 22:00 NPT
Publication date
28 August 2026
Last updated
28 August 2026
Metadata reviewed
3 September 2026
Language
English
Geographic coverage
Suspected source area around Deding and Langtang and the Bhotekoshi–Trishuli corridor through Rasuwa, Nuwakot, Dhading, and Chitwan districts, Nepal.
Bounding box (WGS 84)
Not stated
Temporal coverage
25 August 2026 to 28 August 2026; Event And Rapid Response
Themes
Source Mechanism, Cryosphere, Hydrology, Flood Propagation, Impacts, Infrastructure, Response, Vulnerability

Method and provenance

Production method
IRDR young scientists reviewed satellite observations, weather and river data, government sources including NDRRMA and DHM, and contemporaneous media reporting; the report states that no field data were collected.
Provenance
Prepared by six named IRDR young scientists with institutional affiliations and reviewed by three named IRDR reviewers; published by IRDR.
Validation
Named Expert Review
Uncertainty
The report identifies the source mechanism and chronology as a rapid interpretation, flags unresolved relationships among the breach, seismic signal, and reported sound, and notes that impact figures were changing.
Limitations
The analysis relies on secondary online sources and early satellite observations rather than direct field investigation, and its impact totals are a time-bounded snapshot.

Access and reuse

Access
Direct Open; open access route
Licence
Not verified
Redistribution
Redistribution not authorized
Catalogue status
Reviewed

Assets

Authoritative metadata sources

Spatial extent

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Recorded bounding box